diff options
Diffstat (limited to 'fs/autofs4')
-rw-r--r-- | fs/autofs4/autofs_i.h | 31 | ||||
-rw-r--r-- | fs/autofs4/dev-ioctl.c | 11 | ||||
-rw-r--r-- | fs/autofs4/expire.c | 2 | ||||
-rw-r--r-- | fs/autofs4/inode.c | 63 | ||||
-rw-r--r-- | fs/autofs4/root.c | 218 |
5 files changed, 162 insertions, 163 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h index 8f7cdde4173..3d283abf67d 100644 --- a/fs/autofs4/autofs_i.h +++ b/fs/autofs4/autofs_i.h @@ -75,6 +75,8 @@ struct autofs_info { struct completion expire_complete; struct list_head active; + int active_count; + struct list_head expiring; struct autofs_sb_info *sbi; @@ -95,6 +97,7 @@ struct autofs_info { #define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */ #define AUTOFS_INF_MOUNTPOINT (1<<1) /* mountpoint status for direct expire */ +#define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */ struct autofs_wait_queue { wait_queue_head_t queue; @@ -161,7 +164,7 @@ static inline int autofs4_ispending(struct dentry *dentry) { struct autofs_info *inf = autofs4_dentry_ino(dentry); - if (dentry->d_flags & DCACHE_AUTOFS_PENDING) + if (inf->flags & AUTOFS_INF_PENDING) return 1; if (inf->flags & AUTOFS_INF_EXPIRING) @@ -264,5 +267,31 @@ out: return ret; } +static inline void autofs4_add_expiring(struct dentry *dentry) +{ + struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); + struct autofs_info *ino = autofs4_dentry_ino(dentry); + if (ino) { + spin_lock(&sbi->lookup_lock); + if (list_empty(&ino->expiring)) + list_add(&ino->expiring, &sbi->expiring_list); + spin_unlock(&sbi->lookup_lock); + } + return; +} + +static inline void autofs4_del_expiring(struct dentry *dentry) +{ + struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); + struct autofs_info *ino = autofs4_dentry_ino(dentry); + if (ino) { + spin_lock(&sbi->lookup_lock); + if (!list_empty(&ino->expiring)) + list_del_init(&ino->expiring); + spin_unlock(&sbi->lookup_lock); + } + return; +} + void autofs4_dentry_release(struct dentry *); extern void autofs4_kill_sb(struct super_block *); diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c index 00bf8fcb245..c8a80dffb45 100644 --- a/fs/autofs4/dev-ioctl.c +++ b/fs/autofs4/dev-ioctl.c @@ -544,10 +544,9 @@ static int autofs_dev_ioctl_ismountpoint(struct file *fp, goto out; devid = new_encode_dev(path.mnt->mnt_sb->s_dev); err = 0; - if (path.dentry->d_inode && - path.mnt->mnt_root == path.dentry) { + if (path.mnt->mnt_root == path.dentry) { err = 1; - magic = path.dentry->d_inode->i_sb->s_magic; + magic = path.mnt->mnt_sb->s_magic; } } else { dev_t dev = sbi->sb->s_dev; @@ -560,10 +559,8 @@ static int autofs_dev_ioctl_ismountpoint(struct file *fp, err = have_submounts(path.dentry); - if (path.mnt->mnt_mountpoint != path.mnt->mnt_root) { - if (follow_down(&path)) - magic = path.mnt->mnt_sb->s_magic; - } + if (follow_down(&path)) + magic = path.mnt->mnt_sb->s_magic; } param->ismountpoint.out.devid = devid; diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c index 3da18d45348..a796c9417fb 100644 --- a/fs/autofs4/expire.c +++ b/fs/autofs4/expire.c @@ -27,7 +27,7 @@ static inline int autofs4_can_expire(struct dentry *dentry, return 0; /* No point expiring a pending mount */ - if (dentry->d_flags & DCACHE_AUTOFS_PENDING) + if (ino->flags & AUTOFS_INF_PENDING) return 0; if (!do_now) { diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c index 69c8142da83..821b2b955da 100644 --- a/fs/autofs4/inode.c +++ b/fs/autofs4/inode.c @@ -49,6 +49,7 @@ struct autofs_info *autofs4_init_ino(struct autofs_info *ino, ino->dentry = NULL; ino->size = 0; INIT_LIST_HEAD(&ino->active); + ino->active_count = 0; INIT_LIST_HEAD(&ino->expiring); atomic_set(&ino->count, 0); } @@ -95,63 +96,6 @@ void autofs4_free_ino(struct autofs_info *ino) kfree(ino); } -/* - * Deal with the infamous "Busy inodes after umount ..." message. - * - * Clean up the dentry tree. This happens with autofs if the user - * space program goes away due to a SIGKILL, SIGSEGV etc. - */ -static void autofs4_force_release(struct autofs_sb_info *sbi) -{ - struct dentry *this_parent = sbi->sb->s_root; - struct list_head *next; - - if (!sbi->sb->s_root) - return; - - spin_lock(&dcache_lock); -repeat: - next = this_parent->d_subdirs.next; -resume: - while (next != &this_parent->d_subdirs) { - struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child); - - /* Negative dentry - don`t care */ - if (!simple_positive(dentry)) { - next = next->next; - continue; - } - - if (!list_empty(&dentry->d_subdirs)) { - this_parent = dentry; - goto repeat; - } - - next = next->next; - spin_unlock(&dcache_lock); - - DPRINTK("dentry %p %.*s", - dentry, (int)dentry->d_name.len, dentry->d_name.name); - - dput(dentry); - spin_lock(&dcache_lock); - } - - if (this_parent != sbi->sb->s_root) { - struct dentry *dentry = this_parent; - - next = this_parent->d_u.d_child.next; - this_parent = this_parent->d_parent; - spin_unlock(&dcache_lock); - DPRINTK("parent dentry %p %.*s", - dentry, (int)dentry->d_name.len, dentry->d_name.name); - dput(dentry); - spin_lock(&dcache_lock); - goto resume; - } - spin_unlock(&dcache_lock); -} - void autofs4_kill_sb(struct super_block *sb) { struct autofs_sb_info *sbi = autofs4_sbi(sb); @@ -168,15 +112,12 @@ void autofs4_kill_sb(struct super_block *sb) /* Free wait queues, close pipe */ autofs4_catatonic_mode(sbi); - /* Clean up and release dangling references */ - autofs4_force_release(sbi); - sb->s_fs_info = NULL; kfree(sbi); out_kill_sb: DPRINTK("shutting down"); - kill_anon_super(sb); + kill_litter_super(sb); } static int autofs4_show_options(struct seq_file *m, struct vfsmount *mnt) diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c index b96a3c57359..a015b49891d 100644 --- a/fs/autofs4/root.c +++ b/fs/autofs4/root.c @@ -72,6 +72,46 @@ const struct inode_operations autofs4_dir_inode_operations = { .rmdir = autofs4_dir_rmdir, }; +static void autofs4_add_active(struct dentry *dentry) +{ + struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); + struct autofs_info *ino = autofs4_dentry_ino(dentry); + if (ino) { + spin_lock(&sbi->lookup_lock); + if (!ino->active_count) { + if (list_empty(&ino->active)) + list_add(&ino->active, &sbi->active_list); + } + ino->active_count++; + spin_unlock(&sbi->lookup_lock); + } + return; +} + +static void autofs4_del_active(struct dentry *dentry) +{ + struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); + struct autofs_info *ino = autofs4_dentry_ino(dentry); + if (ino) { + spin_lock(&sbi->lookup_lock); + ino->active_count--; + if (!ino->active_count) { + if (!list_empty(&ino->active)) + list_del_init(&ino->active); + } + spin_unlock(&sbi->lookup_lock); + } + return; +} + +static unsigned int autofs4_need_mount(unsigned int flags) +{ + unsigned int res = 0; + if (flags & (TRIGGER_FLAGS | TRIGGER_INTENTS)) + res = 1; + return res; +} + static int autofs4_dir_open(struct inode *inode, struct file *file) { struct dentry *dentry = file->f_path.dentry; @@ -93,7 +133,7 @@ static int autofs4_dir_open(struct inode *inode, struct file *file) * it. */ spin_lock(&dcache_lock); - if (!d_mountpoint(dentry) && __simple_empty(dentry)) { + if (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) { spin_unlock(&dcache_lock); return -ENOENT; } @@ -126,32 +166,32 @@ static int try_to_fill_dentry(struct dentry *dentry, int flags) /* Turn this into a real negative dentry? */ if (status == -ENOENT) { - spin_lock(&dentry->d_lock); - dentry->d_flags &= ~DCACHE_AUTOFS_PENDING; - spin_unlock(&dentry->d_lock); + spin_lock(&sbi->fs_lock); + ino->flags &= ~AUTOFS_INF_PENDING; + spin_unlock(&sbi->fs_lock); return status; } else if (status) { /* Return a negative dentry, but leave it "pending" */ return status; } /* Trigger mount for path component or follow link */ - } else if (dentry->d_flags & DCACHE_AUTOFS_PENDING || - flags & (TRIGGER_FLAGS | TRIGGER_INTENTS) || + } else if (ino->flags & AUTOFS_INF_PENDING || + autofs4_need_mount(flags) || current->link_count) { DPRINTK("waiting for mount name=%.*s", dentry->d_name.len, dentry->d_name.name); - spin_lock(&dentry->d_lock); - dentry->d_flags |= DCACHE_AUTOFS_PENDING; - spin_unlock(&dentry->d_lock); + spin_lock(&sbi->fs_lock); + ino->flags |= AUTOFS_INF_PENDING; + spin_unlock(&sbi->fs_lock); status = autofs4_wait(sbi, dentry, NFY_MOUNT); DPRINTK("mount done status=%d", status); if (status) { - spin_lock(&dentry->d_lock); - dentry->d_flags &= ~DCACHE_AUTOFS_PENDING; - spin_unlock(&dentry->d_lock); + spin_lock(&sbi->fs_lock); + ino->flags &= ~AUTOFS_INF_PENDING; + spin_unlock(&sbi->fs_lock); return status; } } @@ -160,9 +200,9 @@ static int try_to_fill_dentry(struct dentry *dentry, int flags) if (ino) ino->last_used = jiffies; - spin_lock(&dentry->d_lock); - dentry->d_flags &= ~DCACHE_AUTOFS_PENDING; - spin_unlock(&dentry->d_lock); + spin_lock(&sbi->fs_lock); + ino->flags &= ~AUTOFS_INF_PENDING; + spin_unlock(&sbi->fs_lock); return 0; } @@ -202,19 +242,24 @@ static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd) autofs4_expire_wait(dentry); /* We trigger a mount for almost all flags */ - lookup_type = nd->flags & (TRIGGER_FLAGS | TRIGGER_INTENTS); - if (!(lookup_type || dentry->d_flags & DCACHE_AUTOFS_PENDING)) + lookup_type = autofs4_need_mount(nd->flags); + spin_lock(&sbi->fs_lock); + spin_lock(&dcache_lock); + if (!(lookup_type || ino->flags & AUTOFS_INF_PENDING)) { + spin_unlock(&dcache_lock); + spin_unlock(&sbi->fs_lock); goto follow; + } /* * If the dentry contains directories then it is an autofs * multi-mount with no root mount offset. So don't try to * mount it again. */ - spin_lock(&dcache_lock); - if (dentry->d_flags & DCACHE_AUTOFS_PENDING || - (!d_mountpoint(dentry) && __simple_empty(dentry))) { + if (ino->flags & AUTOFS_INF_PENDING || + (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs))) { spin_unlock(&dcache_lock); + spin_unlock(&sbi->fs_lock); status = try_to_fill_dentry(dentry, 0); if (status) @@ -223,6 +268,7 @@ static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd) goto follow; } spin_unlock(&dcache_lock); + spin_unlock(&sbi->fs_lock); follow: /* * If there is no root mount it must be an autofs @@ -294,8 +340,7 @@ static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd) /* Check for a non-mountpoint directory with no contents */ spin_lock(&dcache_lock); if (S_ISDIR(dentry->d_inode->i_mode) && - !d_mountpoint(dentry) && - __simple_empty(dentry)) { + !d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) { DPRINTK("dentry=%p %.*s, emptydir", dentry, dentry->d_name.len, dentry->d_name.name); spin_unlock(&dcache_lock); @@ -359,8 +404,11 @@ static const struct dentry_operations autofs4_dentry_operations = { .d_release = autofs4_dentry_release, }; -static struct dentry *autofs4_lookup_active(struct autofs_sb_info *sbi, struct dentry *parent, struct qstr *name) +static struct dentry *autofs4_lookup_active(struct dentry *dentry) { + struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); + struct dentry *parent = dentry->d_parent; + struct qstr *name = &dentry->d_name; unsigned int len = name->len; unsigned int hash = name->hash; const unsigned char *str = name->name; @@ -371,23 +419,23 @@ static struct dentry *autofs4_lookup_active(struct autofs_sb_info *sbi, struct d head = &sbi->active_list; list_for_each(p, head) { struct autofs_info *ino; - struct dentry *dentry; + struct dentry *active; struct qstr *qstr; ino = list_entry(p, struct autofs_info, active); - dentry = ino->dentry; + active = ino->dentry; - spin_lock(&dentry->d_lock); + spin_lock(&active->d_lock); /* Already gone? */ - if (atomic_read(&dentry->d_count) == 0) + if (atomic_read(&active->d_count) == 0) goto next; - qstr = &dentry->d_name; + qstr = &active->d_name; - if (dentry->d_name.hash != hash) + if (active->d_name.hash != hash) goto next; - if (dentry->d_parent != parent) + if (active->d_parent != parent) goto next; if (qstr->len != len) @@ -395,15 +443,15 @@ static struct dentry *autofs4_lookup_active(struct autofs_sb_info *sbi, struct d if (memcmp(qstr->name, str, len)) goto next; - if (d_unhashed(dentry)) { - dget(dentry); - spin_unlock(&dentry->d_lock); + if (d_unhashed(active)) { + dget(active); + spin_unlock(&active->d_lock); spin_unlock(&sbi->lookup_lock); spin_unlock(&dcache_lock); - return dentry; + return active; } next: - spin_unlock(&dentry->d_lock); + spin_unlock(&active->d_lock); } spin_unlock(&sbi->lookup_lock); spin_unlock(&dcache_lock); @@ -411,8 +459,11 @@ next: return NULL; } -static struct dentry *autofs4_lookup_expiring(struct autofs_sb_info *sbi, struct dentry *parent, struct qstr *name) +static struct dentry *autofs4_lookup_expiring(struct dentry *dentry) { + struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); + struct dentry *parent = dentry->d_parent; + struct qstr *name = &dentry->d_name; unsigned int len = name->len; unsigned int hash = name->hash; const unsigned char *str = name->name; @@ -423,23 +474,23 @@ static struct dentry *autofs4_lookup_expiring(struct autofs_sb_info *sbi, struct head = &sbi->expiring_list; list_for_each(p, head) { struct autofs_info *ino; - struct dentry *dentry; + struct dentry *expiring; struct qstr *qstr; ino = list_entry(p, struct autofs_info, expiring); - dentry = ino->dentry; + expiring = ino->dentry; - spin_lock(&dentry->d_lock); + spin_lock(&expiring->d_lock); /* Bad luck, we've already been dentry_iput */ - if (!dentry->d_inode) + if (!expiring->d_inode) goto next; - qstr = &dentry->d_name; + qstr = &expiring->d_name; - if (dentry->d_name.hash != hash) + if (expiring->d_name.hash != hash) goto next; - if (dentry->d_parent != parent) + if (expiring->d_parent != parent) goto next; if (qstr->len != len) @@ -447,15 +498,15 @@ static struct dentry *autofs4_lookup_expiring(struct autofs_sb_info *sbi, struct if (memcmp(qstr->name, str, len)) goto next; - if (d_unhashed(dentry)) { - dget(dentry); - spin_unlock(&dentry->d_lock); + if (d_unhashed(expiring)) { + dget(expiring); + spin_unlock(&expiring->d_lock); spin_unlock(&sbi->lookup_lock); spin_unlock(&dcache_lock); - return dentry; + return expiring; } next: - spin_unlock(&dentry->d_lock); + spin_unlock(&expiring->d_lock); } spin_unlock(&sbi->lookup_lock); spin_unlock(&dcache_lock); @@ -468,7 +519,7 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s { struct autofs_sb_info *sbi; struct autofs_info *ino; - struct dentry *expiring, *unhashed; + struct dentry *expiring, *active; int oz_mode; DPRINTK("name = %.*s", @@ -484,10 +535,11 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d", current->pid, task_pgrp_nr(current), sbi->catatonic, oz_mode); - unhashed = autofs4_lookup_active(sbi, dentry->d_parent, &dentry->d_name); - if (unhashed) - dentry = unhashed; - else { + active = autofs4_lookup_active(dentry); + if (active) { + dentry = active; + ino = autofs4_dentry_ino(dentry); + } else { /* * Mark the dentry incomplete but don't hash it. We do this * to serialize our inode creation operations (symlink and @@ -513,36 +565,28 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s dentry->d_fsdata = ino; ino->dentry = dentry; - spin_lock(&sbi->lookup_lock); - list_add(&ino->active, &sbi->active_list); - spin_unlock(&sbi->lookup_lock); + autofs4_add_active(dentry); d_instantiate(dentry, NULL); } if (!oz_mode) { mutex_unlock(&dir->i_mutex); - expiring = autofs4_lookup_expiring(sbi, - dentry->d_parent, - &dentry->d_name); + expiring = autofs4_lookup_expiring(dentry); if (expiring) { /* * If we are racing with expire the request might not * be quite complete but the directory has been removed * so it must have been successful, so just wait for it. */ - ino = autofs4_dentry_ino(expiring); autofs4_expire_wait(expiring); - spin_lock(&sbi->lookup_lock); - if (!list_empty(&ino->expiring)) - list_del_init(&ino->expiring); - spin_unlock(&sbi->lookup_lock); + autofs4_del_expiring(expiring); dput(expiring); } - spin_lock(&dentry->d_lock); - dentry->d_flags |= DCACHE_AUTOFS_PENDING; - spin_unlock(&dentry->d_lock); + spin_lock(&sbi->fs_lock); + ino->flags |= AUTOFS_INF_PENDING; + spin_unlock(&sbi->fs_lock); if (dentry->d_op && dentry->d_op->d_revalidate) (dentry->d_op->d_revalidate)(dentry, nd); mutex_lock(&dir->i_mutex); @@ -552,22 +596,22 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s * If we are still pending, check if we had to handle * a signal. If so we can force a restart.. */ - if (dentry->d_flags & DCACHE_AUTOFS_PENDING) { + if (ino->flags & AUTOFS_INF_PENDING) { /* See if we were interrupted */ if (signal_pending(current)) { sigset_t *sigset = ¤t->pending.signal; if (sigismember (sigset, SIGKILL) || sigismember (sigset, SIGQUIT) || sigismember (sigset, SIGINT)) { - if (unhashed) - dput(unhashed); + if (active) + dput(active); return ERR_PTR(-ERESTARTNOINTR); } } if (!oz_mode) { - spin_lock(&dentry->d_lock); - dentry->d_flags &= ~DCACHE_AUTOFS_PENDING; - spin_unlock(&dentry->d_lock); + spin_lock(&sbi->fs_lock); + ino->flags &= ~AUTOFS_INF_PENDING; + spin_unlock(&sbi->fs_lock); } } @@ -592,14 +636,14 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s else dentry = ERR_PTR(-ENOENT); - if (unhashed) - dput(unhashed); + if (active) + dput(active); return dentry; } - if (unhashed) - return unhashed; + if (active) + return active; return NULL; } @@ -624,10 +668,7 @@ static int autofs4_dir_symlink(struct inode *dir, if (!ino) return -ENOMEM; - spin_lock(&sbi->lookup_lock); - if (!list_empty(&ino->active)) - list_del_init(&ino->active); - spin_unlock(&sbi->lookup_lock); + autofs4_del_active(dentry); ino->size = strlen(symname); cp = kmalloc(ino->size + 1, GFP_KERNEL); @@ -705,10 +746,7 @@ static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry) dir->i_mtime = CURRENT_TIME; spin_lock(&dcache_lock); - spin_lock(&sbi->lookup_lock); - if (list_empty(&ino->expiring)) - list_add(&ino->expiring, &sbi->expiring_list); - spin_unlock(&sbi->lookup_lock); + autofs4_add_expiring(dentry); spin_lock(&dentry->d_lock); __d_drop(dentry); spin_unlock(&dentry->d_lock); @@ -734,10 +772,7 @@ static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry) spin_unlock(&dcache_lock); return -ENOTEMPTY; } - spin_lock(&sbi->lookup_lock); - if (list_empty(&ino->expiring)) - list_add(&ino->expiring, &sbi->expiring_list); - spin_unlock(&sbi->lookup_lock); + autofs4_add_expiring(dentry); spin_lock(&dentry->d_lock); __d_drop(dentry); spin_unlock(&dentry->d_lock); @@ -775,10 +810,7 @@ static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode) if (!ino) return -ENOMEM; - spin_lock(&sbi->lookup_lock); - if (!list_empty(&ino->active)) - list_del_init(&ino->active); - spin_unlock(&sbi->lookup_lock); + autofs4_del_active(dentry); inode = autofs4_get_inode(dir->i_sb, ino); if (!inode) { |